Get banned by the game and didn't know why

My ID is ETNimitz. I just got ban by halo 5, it show at least one player was banned by halo 5. I got leave in the middle of game for once today which is only one time for my entire multiplayer time and accidentally kill one friendly teammate today. Will it lead ban? if it is, how long time it will maintain?

All ban-related questions and discussion should be directed to the pinned official ban thread in the support forum:
https://www.halowaypoint.com/en-us/forums/e0d9938206f04a598ce84f2c8cadce02/topics/the-official-halo-5-why-was-i-banned-thread/19fa6556-e0b1-4248-b817-b3a99d0af5bf/posts